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backend: gl: factor out shader code for masking 

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
This commit is contained in:
Yuxuan Shui 2022-08-24 09:36:56 +01:00
parent 9e8373e3e0
commit b9d4b8a851
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GPG Key ID: D3A4405BE6CC17F4
1 changed files with 31 additions and 21 deletions
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52
src/backend/gl/gl_common.c
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@ -1634,6 +1634,34 @@ void gl_get_blur_size(void *blur_context, int *width, int *height) {
}
// clang-format off
const char *masking_glsl = GLSL(330,
uniform sampler2D mask_tex;
uniform vec2 mask_offset;
uniform float mask_corner_radius;
uniform bool mask_inverted;
in vec2 texcoord;
float mask_rectangle_sdf(vec2 point, vec2 half_size) {
vec2 d = abs(point) - half_size;
return length(max(d, 0.0));
}
float mask_factor() {
vec2 mask_size = textureSize(mask_tex, 0);
vec2 maskcoord = texcoord - mask_offset;
vec4 mask = texture2D(mask_tex, maskcoord / mask_size);
if (mask_corner_radius != 0) {
vec2 inner_size = mask_size - vec2(mask_corner_radius) * 2.0f;
float dist = mask_rectangle_sdf(maskcoord - mask_size / 2.0f,
inner_size / 2.0f) - mask_corner_radius;
if (dist > 0.0f) {
mask.r = (1.0f - clamp(dist, 0.0f, 1.0f));
}
}
if (mask_inverted) {
mask.rgb = 1.0 - mask.rgb;
}
return mask.r;
}
);
const char *win_shader_glsl = GLSL(330,
uniform float opacity;
uniform float dim;
@ -1644,11 +1672,6 @@ const char *win_shader_glsl = GLSL(330,
uniform sampler2D tex;
uniform sampler2D brightness;
uniform float max_brightness;
uniform sampler2D mask_tex;
uniform vec2 mask_offset;
uniform float mask_corner_radius;
uniform bool mask_inverted;
// Signed distance field for rectangle center at (0, 0), with size of
// half_size * 2
float rectangle_sdf(vec2 point, vec2 half_size) {
@ -1695,23 +1718,10 @@ const char *win_shader_glsl = GLSL(330,
}
vec4 window_shader();
float mask_factor();
void main() {
vec2 mask_size = textureSize(mask_tex, 0);
vec2 maskcoord = texcoord - mask_offset;
vec4 mask = texture2D(mask_tex, maskcoord / mask_size);
if (mask_corner_radius != 0) {
vec2 inner_size = mask_size - vec2(mask_corner_radius) * 2.0f;
float dist = rectangle_sdf(maskcoord - mask_size / 2.0f,
inner_size / 2.0f) - mask_corner_radius;
if (dist > 0.0f) {
mask.r = (1.0f - clamp(dist, 0.0f, 1.0f));
}
}
if (mask_inverted) {
mask.rgb = 1.0 - mask.rgb;
}
gl_FragColor = window_shader() * mask.r;
gl_FragColor = window_shader() * mask_factor();
}
);
@ -1740,7 +1750,7 @@ void *gl_create_window_shader(backend_t *backend_data attr_unused, const char *s
auto win_shader = (gl_win_shader_t *)ccalloc(1, gl_win_shader_t);
const char *vert_shaders[2] = {vertex_shader, NULL};
const char *frag_shaders[3] = {win_shader_glsl, source, NULL};
const char *frag_shaders[4] = {win_shader_glsl, masking_glsl, source, NULL};
if (!gl_win_shader_from_stringv(vert_shaders, frag_shaders, win_shader)) {
free(win_shader);